Heat exchanger



July 1o, 192s. 1,576,787

A. W. LlSS/cUER y y HEAT XGHANGER Filed March 3l, 1927 PatentedJuly 10,1928. y i

' UNITEDA v,STATES PATENT l oFFlcE. y

ADOLPH w. LIssAUEn, OE LOUISVILLE, KENTUCKY, assIGNon 'IO LOUISVILLE navt ING MACHINERY co., INO., or LOUISVILLE, KENTUCKY, 'a CORPORATION OE KEN: TUCKY. e'

'naar ExcHaNeEn. y

Application' led March 81, 1927. SerialNo. 179,754.

.My invention relates to a return current the fan until said segmental sections are in indirect. heat exchanger of the rotary type communication with the outlet 18. By this 55 in which the greater heat is applied in the means I am enabled to mmfntain a longer inner 'part of the exchanger. A rcontact between the gas of combustion and The object of the invention is to provide the outer shell and thereb absorb a greater a more rugged heat-v exchanger of higher quantity of heat from' suc gases than if no efficiency and economical in upkeep. lpddles are provided in the annular cham- '00 l In the appended drawin Figure 1 is a r. i longitudinall section vof a eat exchanger At the feeding end of the heat exchanger -1U embodying my invention. Figure 2 is a a suitable feed spout 21 is provided through cross section on line 2 2, Figure 1 and Fgwhlch the material to be dried is charged ure 3 is asimilar section on line 3 3 Figinto the annular space formed by the inner @5 ure 1. v and outer, shells. At the feeding end the- Referring to the drawing, 5 is a furnace annular space enters into a Astationary 4houspreferably of theoil burning type in which ing 22 which leads into the intake of a high the air necessary for combustion is pre-heap, pressure exhaust fan 23. rlhis type of fan ed by by-passing it through a chamber 6 creates a slight vacuum in\the annular space m formed by the refractory linin 7 and the between the inner and outer shells 10 and outer shell 8 of' the furnace. addition, 12 respectively. The outer shell 12 and the the furnace has an air inlet 9 in proximity inner shell 10 at' the juncture of same with to the inner central shell 10 of the heat exthe housing 22 are provided with air sealschanger, the inner shell being in direct com- 24, and the feed hopper 21 is'also provided 75 munication with the furnace 5. A suitable with air sealing means to prevent air in air seal is preferably provided at the juncleakage. n

25 tion 11 of the inner shell l0 with the fur` At the feeding hopper, the shell 12 is pro V nace 5.v Co-axial with the inner shell vis an vided with staggered flights or paddles 25 outer shelll 12 rigidly secured thereto by to facilitate the feed of the material toward 80- suitable stays or bolts 13 provided at suitable the discharge end of the heat 1exchanger. intervals and preferably extending radially. These paddles are perfectly disposed heli.-

Tie-rods 14 are also provided between the .cally to increase the normal pitch of the outer and inner shell near the furnace kend of dryer at thev feedin end for the material. C" the heat exchanger. y 'In addition to t e dights-252 a series ofv 85 l The inner shell at the end remote lfrom the staggered flights 26 are provldedy on the furnace is closed and thereat it is provided innersurface ofthe shell 12 which run lon'- with tubes 15 which project through the 'gitudinally Cooperating with 'the flights outer shell 12 and lead into the stationary 2& 3 and 26 of the shell 12 are i'ghts 27 pro- Outer casing 16. The casing with the Outervided on the outer surface of the inner shell 9o shell 12 forms '.an annular chamber 17 into 10, also running longitudinally. All these "which products of combustion enter from flights in additlon tostirring the material 40 the furnace passing through the inner shell during its travel through the annular space and the tubes 15. of the inner and outer shells 10 and 12 re- The annular chamber 17 has an outlet 18, Spectlvely, strengthen the two shells and 95 leading to a low pressure induced draft fan prevent their -tendenc `tO buckle-under the 19. This Outlet 18 is 'remote from whereactionof the heat. he shell 12 at the distubes 15 enter the annular chamber. charge end is provided with suitable means To increase the path of travel of the pro'd-l for'directlng the material to the central outucts of combustion in the annular chamber, let 28 which leads intoaconveyor 29. The 100 the outer shell 12 is provided with a series of junction of the outlet 28 and the conveyor `flights orpaddles 20, which are secured to are provided with a suitable seal 30 to pre-l the outer shell 12. .These paddles are made vent air `in leakage.

to subdivide the annular chamber into seg- 1t may be'remarked that the air sealsare IJ .mental compartments which force the gases only used in conjunction with a high lpres- 105. entrapped therein from passing directly into sure exhaust fan 23 when a dustless type Aof l a heat exchanger is desired. In janordinary type of heat-exchanger, the air seals are eliminated and a low pressure exhaust fan is used'which will necessarily draw air v into the annular space formed bythe shells and 12 and which airwould absorb the i' vapors due to theapplication of heat to the material to be dried; but essentially the structure of the heat exchanger will be the same with the exception of the type of the fan used and the air seals in connection l Ltherewith.

gases, the same can be made of heavier ma-` The outer shell`12 may be supported on suitable rolls so that ,it could be rotated in any suitable way not illustrated. By making the central shell 10 carry the hottest terial ,and being in diameter smaller than the outer shell, it will have a greater resistance to buckling than would the outer shell if it were directly subject to the hottest ythe exchanger results.

gases as is kcom m'on in these types of ex-` changers.

In subjecting the-outer shell 12 to cooler gases, its tendency to buckle is reduced .and

therefore the same `canbe made of lighter material. Furthermore, the stays .13 rein- .force the two shells and. thereby still furtherdecrease the tendency of the two shellsv to buckle under the heat and weight.

Dueto the `fact that'the hottest gases ar passing through the inner shell first, the losses by radiation are greatlyreduced. By trapping the gases in segmental chambers while travelling on the outside of the outer shell, a longer contact of thehot gases-with In consequence, a

' emore efiicient drying is obtained with the type of heat exchanger described.

I claim: Y v p 1. Inl a' heat exchanger,l a shell -mounted to rotate, astationary casing about the shell forming therewith an annular chamber,

'means forvsupplying products of combustion to sa-1d annular chamber,'llights carried by the shelland disposedin the annular'chamber for controllin v the flow of products of' combustion theret rough, andmeans for re moving the products of combustionv from between the flights at a predetermined,- place of the annular chambe f 2. In aheat exchanger, a sh'elllmounted I to rotate, a stationary casing about the shell forming therewith'an annular chamber, longitudinal flights carried bythe shell in the annular chamber, means for supplying the annular chamber ,with products f combustion, and meansfor removing the products of combustion fromfbetween the flights suc- ,v

cessively at a predetermined place of the annular chamber.

3. In a heat exchanger, a shell.mounted to' rotate, a stationary casing about the shell forming therewith an annular chamber, means carriedy by the shell and dividing the annular chamber into a plurality of longi'tudinally sections, means -f'or supplying products of combustion to the sections of the annular chamber, and means for removing the products of combustion from the `sections successively.

4. /l'n a heat exchanger, a rotary kand a' stationary part forming an annular chamber adapted to receive products of combustion, means dividing the chamber into a plurality of longitudinal sections, land means for removing the products of combustion from 'the sections ofthe annular chamber successively as the rotary part revolves.

5. In a'heat exchanger, a stationary and a rotary part forming alrannular chamber adapted to receive products of combustion,

movable flights in said chamber dividing 4-the same Iinto a plurality of longitudinal sections, and means associated with the stationary partl for removing the products of combustion from said sections successively.

6. In a heat exchanger, a stationary and a rotary part forming an annular chamber adapted to receive products of combustion, longitudinal flights in said chamber dividing the same into sections and means associatedl combustion to lthe vouter annular chamber,

means for removing the products of combustion from the outer. annular chamber, `and means in saidouter chamber dividing the same into a plurality of longitudinal sections, each 'adapted to register with the means for removing the products of combustion as theurotary -part mentioned re .volves.

' ADQLPH W. LISSAUER. v 

